package util;


import java.sql.*;

public class JdbcUtils {
    //可以把几个字符串定义成常量：用户名，密码，URL，驱动类
    private static final String USER = "root";
    private static final String PWD = "root";
    private static final String URL = "jdbc:mysql://localhost:3306/学校运动会";
    private static final String DRIVER = "com.mysql.cj.jdbc.Driver";

    /**
     * 驱动的注册
     */
    static {
        try {
            Class.forName(DRIVER);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    /**
     * 得到数据库的连接
     * @return : 返回数据库的连接
     * @throws SQLException : SQL的异常
     */
    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(URL,USER,PWD);
    }

    /**
     * 关闭资源
     * @param conn  连接对象
     * @param ps  statement
     * @param rs  resultSet
     */
    public static void close(Connection conn, Statement ps, ResultSet rs){
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (ps != null) {
            try {
                ps.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (rs!= null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void close(Connection conn, Statement ps ){
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (ps != null) {
            try {
                ps.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }
}
